Dowell



(No Model.)

12H. MGDOWBLL. ROCK AND ORB CRUSEER.

Patented July 7, 1885..

UNITED STATES PATENT OEEICE- FREDERICK H. MCDOWELL, OF BROOKLYN, NEVYORK.

ROCK AND one cRUsHER'.

rECIFICATION forming part 0f Letters Patent No. 321,834, dated July 7,1885.

Application tiled September 8, 1884. (No model.)

To all whom, it may concern:

Be it known that I, FREDERICK H. AMC- DOWELL, of Brooklyn, Kings county,in the State of New York, have invented certain new and usefulImprovements in Rock and Ore Crushers, of which the following is aspecification.

The machine has two jaws moved simultaneously in opposite directions bya single actuating crank. The force is applied through toggle-levers,one of which acts directly on one jaw, and the other acts'indirectly onthe other jaw through a stout yoke embracing the framing. The pitmanwhich actuates the toggle is guided. After each crushing action the jawsare returned to their original positions by a sufficient spring force.

Inrwhat I esteem the most complete form of the invention the two movingjaws are mounted at a considerable distance apart, and there is anintermediate stationary j aw or part between them.

The accompanying drawings form a part of this specification, andrepresent what I consider the best means of carrying out the invention.

Figure l is a central vertical section of my improved crusher. Fig. 2 isa plan view, partly in horizontal section, of the same.

Similar letters of reference indicate corresponding parts in thefigures.

A is a rigid frame-work of castiron or other suitable material, certainportions being designated by additional letters, as A A2. The highestportions, A', of the framing A form .bearings for a horizontal shaft, B,carrying a fly-wheel, B', and a broad eccentric, B2. The latter operatesa pitman, O, the lower end of which is provided with trunnions c, whichengage in blocks D, each tted to move tight and easy in a verticalgroove, a, in the framing A.

G and H are stout jaws,mounted in reverse positions relatively to eachother, and fitted with shafts g l1, supported in bearing-blocks A3 A4,mounted in the framingA, as described further on. The jaw G has an arm,G', and the jaw H has an arm, H. Both these arms extend downward, andare subject to a strong contractile force from rubber 'springs oranalogous springs J mounted on a longitudinal bar or tie-rod, I. Thesesprings J exert a force tending to draw together the arms G H', andconsequently to throw apart the jaws G and H, which are above the shaftsg h.

M and N are broad castings, serving as toggle-levers. One end of eachabuts against a bearingblock, C', of chilled iron, hardened steel, orother suitable material set in the adjacent face of the pitman G. Theouter end of the toggle-lever M bears against a correspondingbearing-block, G, on the back of the jaw G. The outer end of thetoggle-lever N bears against a corresponding bearing block, E', fixed ina cross-head, E. This portion E carries two stout horizontal rods, E2,which are tted to work endwise through corresponding apertures formed inthe framing A. The other ends of the rods E2 are engaged by nuts E3 witha stout cross-head, E. This latter acts by a bearing block, E5, againsta bearingblock, H2, on the jaw H.

The wheel B is on an overhanging portion of the shaft B at the back sideof the machine. The shaft B overhangs to astill greater eX- tent on thefront side of the machine, as indicated in dotted lines in Fig. A2. Itcarries another fly-wheel, B3, and also a fast pulley, B, and a loosepulley, B5. (Shown in dotted lines.) A belt from a steam-engine or othersuitable power (not represented) runs on the fast pulley B4 and rotatesthe shaft, which by the eccentric B2 works the pitman G up and down, thelower end being guided in a strictly vertical path by the blocks D. Ateach descent the toggle-lever M thrusts the jaw Gto the left, and thetoggle-lever N thrusts the crosshead E, and consequently the connectedjaw H, to the right. motion of the jaws G and H toward each other isproduced at each descent of the pitman C. At each ascent of the pitmanthe springs J assert themselves, and by acting on the arms G H open thejaws G H.

A2 is a stout cross-piece, stationary bar, or dead-block iixed in theframing of the machine, and partly filling the space between the jaws Gand H. The inner sides of G and H are faced with chilled-iron or steelcrushing-plates g h. The adjacent faces ofthe trans- Thus a simultaneousclosing IOOv verse frame-piece A2 are similarly faced with chilled ironor steel a a2. The acting-faces y It a" a2 are inclined, as shown, tofavor the reception and crushing of ore or rock, which is supplied bythe attendantin the space between the jaws G and H above the framing A2,as will be understood.

The shafts g 7L of the movable jaws have bearings in blocks A3 and A4,which are mounted in horizontal slots upon either side of the machine. Asingle binder, A5, extends entirely across the machine, and bolts A6 andnuts A7 serve to confine the whole together. Each bolt AG may extendthrough the framing and be equipped with a stout head or nut outside; orit may be tapped or otherwise secured in the framing. This portion oftheapparatus should be able to resist great strains, as will be obvious.

The ends of the transverse framing A2 may be allowed a little playbetween the blocks A3 A2 at each end; or it may be held tightly in theblocks, as the engineer may prefer. If loose, it will shift itself totheright and left to small extents, according as the quantity of thematerial or the hardness in one side or the other shall be in excesswhen the jaws G H partially close by the descent of the pitman C. Thefresh quantity of ore or other material to be crushed descends betweenthe acting-faces at each opening of the jaws, and the quantity thusreceived at each side of the piece A2 will be about equal.

Modifications may be made in the forms and proportions within widelimits.

The crushing-faces g h a a2 may be, and under ordinary circumstancespreferably are, ridged horizontally, to better retain any round smoothlump which might otherwise tend to escape by sliding upward when thejaws come together.

The framing may be varied in form. The blocks A A4, which form bearingsfor the shafts g h, may be deeper or wider. Various means may beemployed, as wedges or other obvious devices, for adjusting these partsat various distances apart. The binder A5, and its securing bolts andnuts A A7, may be made much heavier than here shown. It is importantthat all the parts be simple in construction and adjustment, so that thema chine can be adjusted and operated safely and worked successfully byunskilled labor.

The intermediate cross-frame, A2, between the jaws may be omitted; butin such case the jaws should be worked nearer together. In such casethose blocks should each be recessed, like the blocks G2 E', to afford anearly or quite semi-cylindrical pocket for the correspondingly-formedends of the toggle.

I can extend down more than one arm from each jaw, G H. I can employmore than one tie-rod I and more than one pair of springs J. I can, ifdesired, in any case use only one spring, J, on one end of the rod I,its action being by the rod I made effective on both jaws. I prefer asingle rod, I, and two springs, J, as shown. j

The bearing-blocks G2 H2 are bedded in the respective jaws G H, on alayer of elastic materia-l, G3 H2. I have in my experiments made thiselastic material of soft vulcanized rubber; but I believe I can use feltor a series of plates of thin metal, some or all of which shall becorrugated.

My binder A5 is V-shaped on the face which is presented toward the partsA2 A3 A4. This allows the binder to rock slightly if the nuts A7 shouldbe adjusted unequally. The force with which the shafts g 7i are heldtogether depends on the strength of the bolts A2. These should, asbefore stated, be strong, but they will necessarily constitute theweakest portion, and in case a Sledge-hammer or other object is throughmalice or accident inserted in the machine, the machine will yield bythe fracture simply of these bolts A, thus letting the pieces A2 A3 A4move apart. This is of advantage, by saving the more costly parts of themachine from fracture. The introduction of new bolts A6. can be effectedin a short period, and the machine will then be ready to go on again asbefore.

I claim as my inventionl. In a rock and ore Crusher, the combination,with a stationary jaw, as A2, having beveled faces, of two movable jaws,as G H, arranged one upon either side of the stationary jaw, and means,as described, for operating said jaws simultaneously in oppositedirections, as set forth.

2. In a rock and ore crusher, the pitman C, guided at its lower end,substantially as shown, in combination. with the toggles M N, frame E E2E, jaws G H, and stationary jaw A2, arranged for joint operation,substantially as herein specified.

3. In a rock and ore crusher, the jaws G H, with their respective arms GH, operating means, as B C M N, and yoke E E2 E2, in combination witheach other and withl the tensionrods I and springs J, arranged for jointoperation, as herein specified.

4. In a rock and ore crusher, the bearingblocks G2 H2 and stationary jawA2, in combination with the jaws G H, their operating means, the stoutframing A, binder A5, bolts A, and nuts A2, arranged for jointoperation, substantially as herein specified.

In testimony whereof I have hereunto set my hand, at New York city, NewYork, this 6th day of September, 1884, in the presence of twosubscribing witnesses.

FREDERICK H. MCDOVELL.

Vitnesses:

CHARLES R. SEARLE, J. E. RENWHE.

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